import React, { Component } from 'react'
import PropTypes from 'prop-types'
import './index.scss'

export default class Header extends Component {

  static propTypes = {
    addTodo:PropTypes.func.isRequired
  }

  handleKeyUp = (event) => {
    const { key, target } = event
    if (target.value.trim() === '') {
      alert('输入不能为空')
      return
    }
    const id = new Date().getTime()
    if (key !== 'Enter') return
    const todoObj = { id: id, name: target.value, done: false }
    this.props.addTodo(todoObj)
    target.value = ''
  }


  render() {
    return (
      <div className='todo-header'>
        <input onKeyUp={this.handleKeyUp} type="text" placeholder='请输入不得任务名称，按回车确认' />
      </div>
    )
  }
}
